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関連する概念動画

Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

2.9K
Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
2.9K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

26.6K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
26.6K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

42.7K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
42.7K
Polymer Classification: Architecture01:14

Polymer Classification: Architecture

2.7K
Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
2.7K
Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

2.5K
Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...
2.5K
Frost Circles for Different Conjugated Systems01:18

Frost Circles for Different Conjugated Systems

2.7K
The inscribed polygon method is consistent with Hückel’s 4n + 2 rule and helps to learn whether the given cyclic compound is aromatic or not. The compound is stable and aromatic if every bonding molecular orbital (MO) is completely filled with a pair of electrons. However, if the non-bonding or antibonding orbitals are filled with electrons, the compound is unstable and not aromatic. Consider the Frost circle diagrams for cycloalkenes containing 4 to 8 carbons.
2.7K

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関連する実験動画

Updated: Jul 8, 2025

Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
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Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface

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結晶型ポリフェニレンコバルント有機フレームワーク

Xing Han1,2, Zihui Zhou1,2, Kaiyu Wang1,2

  • 1Department of Chemistry and Kavli Energy Nanoscience Institute, University of California, Berkeley, California 94720, United States.

Journal of the American Chemical Society
|December 18, 2023
PubMed
まとめ
この要約は機械生成です。

新しい多孔ポリフェニレン共性有機フレームワーク (COF) が合成され,化学的に安定していることが判明した. これらの材料は,空気と煙気から二酸化炭素を吸収する有望な能力を有しています.

さらに関連する動画

Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks
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Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks

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Synthesis and Characterization of Functionalized Metal-organic Frameworks
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Synthesis and Characterization of Functionalized Metal-organic Frameworks

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関連する実験動画

Last Updated: Jul 8, 2025

Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
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Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface

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Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks
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Synthesis and Characterization of Functionalized Metal-organic Frameworks
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科学分野:

  • 材料科学
  • 有機化学
  • ナノテクノロジー

背景:

  • 協和有機フレームワーク (COF) は,調節性特性を有する結晶性多孔ポリマーである.
  • 炭素キャプチャなどの環境用途のための堅固なCOFの開発は重要な研究分野です.

研究 の 目的:

  • 新しい結晶型ポリフェニレンCOFをフッ素化ビルディングユニットで合成する.
  • 合成されたCOFの構造的,化学的安定性,およびCO2捕獲特性について調査する.

主な方法:

  • アルドール・サイクロトリメリゼーションによるフッ化トリス ((4-アセチルフェニル) ベンゼンの合成.
  • 粉末X線 difraktion,FTIR,および固体13C CP/MAS NMRスペクトロシーを用いた構造的特徴づけ.
  • 厳しい環境における化学的安定性の評価と,合成後のCO2吸収に関する研究.

主要な成果:

  • 2つの結晶型ポリフェニレンCOFが成功して合成された.
  • COFは1週間以上腐食性環境で高孔性と優れた化学的安定性を示した.
  • 合成後のCOFは,周囲の空気と煙気からCO2を大量に吸収することが示された.

結論:

  • 合成されたポリフェニレンCOFは頑丈で安定した材料です.
  • これらのCOFは,炭素捕獲技術の有望な候補である.
  • アルドルサイクロトリメリゼーションは,安定したCOF構造を生み出すための効果的な方法である.